Simplify the expressions: 11y - 8y - 2y, 4k+(5k+11)), (-3q-2q) + (5a + q)

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

Which of the following parabolas opens down?

What is the sum of these mixed numbers 4 2/3+ 3 1/9